Sterling silver metal is not suitable for healing piercings as it tarnishes a lot and tends to irritate the piercing. Your starter jewelry should be surgical stainless steel or 14k gold, or titanium or niobium.
Never apply aspirin to anything that is bleeding, as it thins the blood and prevents clotting somewhat, making you bleed more.
If the jewelry rubs against your nose, this friction will cause a bump called a keloid, which is a type of scar tissue. Many people like to wear rings when first healing nost piercings as they allow more room for cleaning and fresh air to get to the piercing and they rub less.
You can read about how to get rid of keloids in the Nose Piercing eBook,
http://www.bellaonline.com/ebooks/ebook33